"The Girl Is Mine" is a 1982 hit duet by Michael Jackson and Paul McCartney. Fully credited as composed by Michael Jackson and released as the first single from Jackson's biggest selling album, Thriller, the song was about two men fighting over the love of one woman, each claiming that he can love the woman better than the other. It leads into a spoken debate near the end of the song by the two singers with Jackson giving his now famous line: "Paul, I think I told you - I'm a lover, not a fighter." The song peaked at number two on the Billboard Hot 100 and number one on the Soul Singles Chart in the winter of 1982-83 before Jackson's second single from Thriller ("Billie Jean") took over its spot the next month. On the Adult Contemporary chart, it was the first Michael Jackson single to reach #1; he would not top the A/C chart again until "I Just Can't Stop Loving You" in 1987. Jackson and McCartney recorded other duets, including the more successful "Say Say Say" and "The Man" in 1983, which were included on Paul's 1983 album Pipes of Peace.

The song has recently been re-recorded by Jackson and R&B artist will.i.am for the Thriller - 25th anniversary Edition album called Thriller 25.